I mean, personal aesthetics are not allowed on the wiki's main namespace, but that doesn't stop you from creating your own style elsewhere. Make your own blog/website, create a Pinterest board, Spotify playlist, etc.

Start by making an aesthetic on tumblr or Pinterest and then post lots of tags to try to get it to be trendy but it might take a long time

An example is starrflesh, the personal aesthetic needs to be unique and present in culture, but also memorable as well.